CN104209340A - Bilateral wave control method for hot-rolled martensitic stainless steel strip steel - Google Patents
Bilateral wave control method for hot-rolled martensitic stainless steel strip steel Download PDFInfo
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Abstract
The invention provides a bilateral wave control method for hot-rolled martensitic stainless steel strip steel, and belongs to the field of metal plate machining and processing. The bilateral wave control method is characterized by including the following steps of implementing wave pre-compensation rolling in the rolling process, changing the shape of load gaps by regulating the roll bending force, conducting dynamic control, relieving edge wave tendency of the strip steel straightness in the links after rolling is conducted so as to make strip steel reach the target straightness, solving the strip shape problem caused by transverse uneven temperature distribution in the cooling process by adopting the sparse cooling mode in laminar cooling, and conducting follow-up processing on strip steel placed in the coil yard through a slow-cooling method so as to reduce temperature unevenness in the cooling process and overcome the strip shape defect. The influence rules of all procedures on product straightness are taken into consideration as a whole from the aspect of the whole process, the multi-procedure comprehensive control method is implemented, the improvement of the product strip shape quality is facilitated, and the bilateral wave control method can be widely used for the strip shape control field of hot-rolled strip steel products.
Description
Technical field
The invention belongs to metallic plate without machining or process field, particularly relate to a kind of board-shape control method for hot-strip product.
Background technology
Martensitic stain less steel possesses high strength and corrosion resistance, manufacturing machine part can be used for as the blade of steamturbine, the axle of steam equipment and pull bar, and the part worked in corrosive medium, the grade of steel that carbon content is higher is then applicable to manufacture medicine equipment, table knife, measurement apparatus, spring etc.
" plate shape " (mainly referring to glacing flatness) is the important quality index of hot rolling martensitic stainless steel belt product made from steel.
So-called " plate shape ", refers to wave or the wooden dipper song of band steel in appearance, its essence is the uneven distribution of band steel internal residual stress.
The wave of hot-strip product or wooden dipper song just show when internal residual stress is larger, if band steel internal residual stress is not enough to cause band steel flexing, but after slitting, there will be wave or wooden dipper song, are then called potential glacing flatness problem.
Bilateral wave is a kind of common flatness defect (as shown in Figure 1) during hot rolling martensitic stain less steel is produced, and uses totally unfavorable to production stability and downstream user, easily causes and batches staggered floor, surface wiping scuffing, process workpiece side sway, the problems such as song of wafing.
As shown in Figure 2, it mainly comprises heating furnace, roughing mill, finishing mill, template checkout gear, runout table cooling device (representing with section cooling in figure) and coiling machine to the apparatus for production line layout of hot rolling martensitic stainless steel belt steel (hereinafter referred to as band steel).
Production technology with steel as shown in Figure 3, mainly comprise heating, roughing, finish rolling, section cooling, batch, warehouse of steel roll cooling, annealing, the technical process such as pickling.Visible, as a complete manufacture course of products, band steel, after coiling process, also will to cool through warehouse of steel roll, the operation/process such as annealing; Therebetween, band steel experienced by the continuous change of geomery, temperature, microstructure, and the ess-strain caused thus is also in continuous change.
Due to the distortion uneven along strip width direction, Temperature Distribution, will the uneven distribution of corresponding ess-strain be caused, and the flatness defect of resulting belt steel may be brought.
The operation of rolling is the important step affecting hot rolling martensitic stainless steel belt steel plate shape.Modern hot strip rolling mill is substantially all configured with complete Strip Shape Control means and Controlling model, good control can be realized to the plate shape of the operation of rolling.
Except the operation of rolling, the plate shape of hot rolling martensitic stain less steel is also subject to the impact of rolling rear process links, the band steel that namely finish rolling plate shape is good, after supercooling, annealing, may show flatness defect.
What require product quality along with user improves constantly, and the bilateral unrestrained problem of hot rolling martensitic stainless steel belt steel seems and becomes increasingly conspicuous, and in the urgent need to from full-range angle, considers that links is on the impact of plate shape, seeks bilateral unrestrained control method.
For operation of rolling Strip Shape Control, the past carries out excessive quantifier elimination, at present existing abundant theoretical foundation and complete control device.
For the limit waveization problem of band steel in roller repairing process, common solution comprises operation of rolling glacing flatness precompensation, steel edge portion concurrent heating and cooling edge part shading etc.
A kind of cooling means of high-temperature steel plate is disclosed in Japan Patent JP60166117A and JP59232235A, namely in cooling procedure, adopt retaining device to cover the cooling water in steel plate edge certain limit, reduce edge temperature drop, improve band steel transverse temperature uniformity and glacing flatness.A kind of metal plate flatness controlling method and device is then disclosed in patent JP2001137943A, JP4109407B2 and EP1153673A1, by being equipped with strip edge heater in rolling outlet, local concurrent heating is carried out to steel plate, improves temperature homogeneity and glacing flatness quality.
But for not being equipped with the existing hot rolling line of edge part shading and heater, aforesaid two kinds of methods all need to increase newly, install corresponding apparatus, and one-time investment is larger.
And in patent CN1485156A, disclosing unrestrained control method in a kind of hot-strip, it is by carrying out middle unrestrained compensatory control to fine-rolling strip steel glacing flatness, with the bilateral wave produced in laminar cooling process with steel after effectively eliminating finish rolling, improve strip shape quality.Similarly, in patent CN101372018A, then disclose a kind of diversified cross-connection control method for plate shape of hot rolling band steel, its measure mainly comprises: (1) adjustment rolling load and bending roller force Dynamic controlling; (2) revise hot target flatness degree controlling value, adopt slight center wave rolling; (3) section cooling adopts rear cold mode; (4) modifying target coiling temperature; (5) roll shifting of finishing mill the 6th frame working roll is used to compensate; (6) use of cooling water between milling train is optimized.
Be find in actual production process, the technical scheme of above-mentioned two patents is not considered and the impact of the cooling of follow-up warehouse of steel roll and annealing is made its practical effect be subject to certain impact.
Summary of the invention
Technical problem to be solved by this invention is to provide the bilateral unrestrained control method of a kind of hot rolling martensitic stainless steel belt steel, it considers the affecting laws of each operation to glacing flatness, from full-range angle, consider the impact of links, implement multiple operation integrated control method, have received good result, contribute to improving bilateral unrestrained defect, improve the strip shape quality of product further.
Technical scheme of the present invention is: provide a kind of hot rolling martensitic stainless steel belt steel bilateral unrestrained control method, be included in the operation of rolling and implement precompensation rolling and cool at laminar flow cooling ordered pair band steel, it is characterized in that described bilateral unrestrained control method comprises the following steps:
A) in the described operation of rolling, precompensation rolling is carried out according to following method:
A1, unrestrained precompensation rolling in the operation of rolling is implemented, namely target flatness degree is wave value in;
F5, F6 and F7 frame of A2, selection finishing rolling step is as adjustment frame;
A3, under finishing mill outlet detects that the glacing flatness of band steel to be discontented with in foot-eye the condition of wave, dynamic adjustments is carried out to the bending roller force of F5, F6 and F7 frame;
A4, by adjustment bending roller force, change loading roll gap shape, carry out Dynamic controlling, alleviate the limit waveization of rolling strip profile and flatness in metasomite and tend to, make band steel reach target flatness degree;
B) in described section cooling operation, according to following method, band steel is cooled:
B1, sparse refrigerating mode is adopted to cooling section;
B2, the method for operation adopting each group of cooling manifold interval to open at cooling section;
B3, to be alleviated the plate shape problem that transverse temperature skewness in cooling procedure brings by sparse refrigerating mode;
C) after described section cooling operation terminates, following method is adopted to carry out subsequent treatment to the band steel be placed in warehouse of steel roll:
C1, employing slow cooling mode carry out follow-up disposal to the band steel be placed in warehouse of steel roll, and its cooling rate or rate of temperature fall are less than 5 DEG C/s, to reduce the non-uniform temperature in cooling procedure, improve flatness defect.
Bilateral unrestrained control method described in it is controlled by wave in taking at finishing rolling step, adopt sparse refrigerating mode in section cooling operation and adopt slow cooling mode at warehouse of steel roll to band steel finished product volume, consider the affecting laws of each operation to belt steel product glacing flatness, implement multiple operation Comprehensive Control, to improve the bilateral unrestrained defect of belt steel product, improve the strip shape quality of product.
Concrete, the method for operation that described in it, each group cooling manifold interval is opened, comprises the method for operation that in two groups of adjacent cooling manifolds, a group of collector unlatching, another group cooling manifold are closed.
Or the method for operation that described in it, each group cooling manifold interval is opened, comprises the method for operation that between three groups of adjacent cooling manifolds, a group of cooling manifold unlatching, other two groups of group cooling manifolds are closed.
Or the method for operation that described in it, each group cooling manifold interval is opened, comprises the method for operation that between three groups of adjacent cooling manifolds, a group of cooling manifold closedown, other two groups of group cooling manifolds are opened.
Slow cooling mode described in it comprises employing burial pit mode, or in warehouse of steel roll, coil of strip is positioned over stacking inside, and other product coil of strips of four periderms surround.
Described bilateral unrestrained control method is applicable to hot-strip and produces, and its strip width is 600 ~ 2200mm, and its belt steel thickness is 2 ~ 8mm, and the coiling temperature of band steel is in the scope of 600 ~ 850 DEG C.
Compared with the prior art, advantage of the present invention is:
1. from full-range angle, consider the impact of each operation/link, take comprehensive control measure, consider the affecting laws of each operation to product glacing flatness as a whole, implement multiple operation integrated control method, achieve good results, improve bilateral unrestrained defect, contribute to improving product strip shape quality;
2., without the need to increasing extra equipment or investment, the product quality contributing to existing production line improves.
Accompanying drawing explanation
Fig. 1 is the structural representation of the bilateral unrestrained defect of band steel;
Fig. 2 is the schematic layout pattern of existing hot rolling martensitic stainless steel belt steel apparatus for production line;
Fig. 3 is the production technology schematic diagram of existing hot rolling martensitic stainless steel belt steel;
Fig. 4 is cooling section equipment cooling manifold schematic layout pattern;
Fig. 5 is the block diagram of control method of the present invention;
Fig. 6 is warehouse of steel roll stacking schematic diagram.
In figure, F1 ~ F7 is finishing mill frame, and DC1 is coiling machine, and A is band steel,
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
In Fig. 4, the production technology of existing band steel cools at laminar flow cooling ordered pair stainless steel strip A, its section cooling operation comprises multiple cooling section (bank), and a complete section cooling operation generally includes or be divided into three cooled region/cooling sections (representing with Normal, main cold-zone and cold sperm district in figure).
At each cooling section, being provided with and organizing cooling manifold (representing with numeral number 1 ~ 17 in figure) more, for often organizing cooling manifold, all can control separately its work of whether spraying water, play the cooling effect to band steel.
The impact of multiple links such as in Fig. 5, hot rolling martensitic stainless steel shape is subject to rolling, cools, batches, annealing, improving its bilateral unrestrained flatness defect needs from full-range angle, considers the impact of links, takes comprehensive control measure.
The bilateral unrestrained control method concrete scheme of hot rolling martensitic stain less steel that the present invention proposes is as follows:
(1) finish rolling takes middle wave to control:
In order to alleviate the limit waveization trend of rolling strip profile and flatness in metasomite, unrestrained precompensation rolling in the operation of rolling is implemented, namely target flatness degree is wave value in.The glacing flatness of finish rolling outlet band steel is relevant with operation of rolling band steel percentage elongation uneven distribution in the width direction, can change loading roll gap shape and carry out Dynamic controlling, make it reach target flatness degree by adjustment bending roller force.Select F5, F6 and F7 of finish rolling as adjustment frame, namely under finish rolling outlet detects that glacing flatness is discontented with the condition of wave in foot-eye, dynamic adjustments is carried out to the bending roller force of F5, F6 and F7 frame, makes strip profile and flatness reach target zone.
Due to the bending roller force in the finish rolling stage by adjustment frame, the method making strip profile and flatness reach target zone has had many discussions and bibliography, therefore its specific implementation approach and technological means no longer describe at this.
(2) section cooling adopts sparse refrigerating mode:
In whole hot rolling is produced, especially after rolling, in laminar cooling process, in the middle part of edge temperature drop speed is greater than usually, make steel edge portion temperature lower than middle part, cause final wave defect.In order to alleviate the plate shape problem that transverse temperature skewness in cooling procedure brings, hot rolling martensitic stain less steel adopts sparse refrigerating mode in producing, i.e. cooling section (BANK) discontinuous unlatching, but adopt interval cooling, following table 1 gives any three kinds of sparse refrigerating modes:
The sparse refrigerating mode of table 1
| BANK | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | … |
| Pattern 1 | on | off | on | off | on | off | on | off | on | … |
| Pattern 2 | on | off | off | on | off | off | on | off | off | … |
| Mode 3 | on | on | off | on | on | off | on | on | off | … |
" on " in form represents that this group cooling manifold is opening, and " off " represents that this group cooling manifold is closed condition.
Visible, the method for operation that each group cooling manifold interval is opened, comprises the method for operation that in two groups of adjacent cooling manifolds, a group of collector unlatching, another group cooling manifold are closed; The method of operation that between the method for operation cooling manifold adjacent with three groups that between three groups of adjacent cooling manifolds, one group of cooling manifold is opened, other two groups of group cooling manifolds are closed, one group of cooling manifold is closed, other two groups of group cooling manifolds are opened.
When reality is implemented, not only be confined to above-mentioned provide several regular spaced apartly start shipment row mode, can also adopt and the non-regular spaced apart of described pattern 1 ~ mode 3 mixed running is started shipment row mode, to reach required cooling effect, be not described in detail in this.
(3) warehouse of steel roll adopts slow cooling mode:
In order to reduce the non-uniform temperature in cooling procedure, improve flatness defect, in warehouse of steel roll, coilcooling adopts slow cooling mode, burial pit mode can be adopted, also in warehouse of steel roll, coil of strip can be positioned over stacking inside, other product coil of strips of four periderms surround, and ensure that cooling rate or rate of temperature fall are less than 5 DEG C/s, specifically as shown in Figure 6.
Due to those skilled in the art, above-mentioned slow cooling mode is appreciated that completely and easily realizes, therefore the design parameters such as the temperature fall time of its concrete rate of temperature fall, needs maintenance no longer describe at this.
In hot rolling martensitic stainless steel belt steel is produced, the good band steel of finish rolling outlet glacing flatness, through supercooling, batches, after annealing etc., may show bilateral unrestrained flatness defect, affect lower procedure operation and user's use.The problems existed in producing for hot rolling martensitic stain less steel, the technical program considers the affecting laws of each operation to glacing flatness, implement multiple operation integrated control method, have received good technique effect, improve the bilateral unrestrained defect of band steel, contribute to the strip shape quality improving product further.
Embodiment
Embodiment one:
To certain martensitic stainless steel belt product made from steel, its specification is 2.5 × 1080mm, finishing temperature 980 DEG C, coiling temperature 750 DEG C.
Adopt the bilateral unrestrained control method of the technical program to carry out hot rolling production, table 2 is depicted as and adopts new method and the product glacing flatness do not adopted under new method condition.
Strip profile and flatness under table 2 aging method and new method
| Sequence number | Employing method | Hot rolling glacing flatness (I) |
| 1 | New method | 15.6 |
| 2 | Aging method | 76.2 |
Embodiment two:
To certain martensitic stainless steel belt product made from steel, its specification is 4.6 × 1420mm, finishing temperature 930 DEG C, coiling temperature 750 DEG C.
Adopt the bilateral unrestrained control method of the technical program to carry out hot rolling production, table 3 is depicted as and adopts new method and the product glacing flatness do not adopted under new method condition.
Strip profile and flatness under table 3 aging method and new method
| Sequence number | Employing method | Product glacing flatness (I) |
| 1 | New method | 21.5 |
| 2 | Aging method | 54.2 |
Embodiment three:
To certain martensitic stainless steel belt product made from steel, specification 3 × 1250mm, finishing temperature 980 DEG C, coiling temperature 750 DEG C.
Adopt the bilateral unrestrained control method of the technical program to carry out hot rolling production, table 4 is depicted as and adopts new method and the product glacing flatness do not adopted under new method condition.
Strip profile and flatness under table 4 aging method and new method
| Sequence number | Employing method | Product glacing flatness (I) |
| 1 | New method | 9.4 |
| 2 | Aging method | 121.8 |
Consider that the impact of links produced by hot rolling martensitic stain less steel, technical scheme of the present invention is intended to propose a kind of bilateral unrestrained control method comprehensively, and to improve the bilateral wave of belt steel product, it comprises following technical essential:
1) in order to alleviate the limit waveization trend of rolling metasomite band steel, unrestrained precompensation rolling in the operation of rolling is implemented;
2) in order to alleviate the plate shape problem that transverse temperature skewness in laminar cooling process brings, sparse refrigerating mode in production, is adopted;
3) in order to the plate shape problem that the non-uniform temperature reduced in warehouse of steel roll cooling procedure is brought, in warehouse of steel roll, coilcooling adopts slow cooling mode.
This method is applicable to hot-strip and produces strip width 600 ~ 2200mm, thickness 2 ~ 8mm, and coiling temperature is the scope of 600 ~ 850 DEG C.
This method can be used for improving the bilateral unrestrained flatness defect of hot rolling martensitic stain less steel.For the hot rolling line that there is martensite belt product made from steel glacing flatness problem both at home and abroad, the method is applicable, and popularizing application prospect is wide.
Because technical scheme of the present invention is from full-range angle, consider the impact of each operation/link, take comprehensive control measure, consider the affecting laws of each operation to product glacing flatness as a whole, implement multiple operation integrated control method, achieve good results, can be used for improving the bilateral unrestrained flatness defect of hot rolling martensitic stain less steel, contribute to improving product strip shape quality; And its implementation process is without the need to increasing extra equipment or investment, contribute to improvement or the raising of existing product of production line quality.
The present invention can be widely used in the Strip Shape Control field of hot-strip product.
Claims (8)
1. the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel, is included in the operation of rolling and implements precompensation rolling and cool at laminar flow cooling ordered pair band steel, it is characterized in that described bilateral unrestrained control method comprises the following steps:
A) in the described operation of rolling, precompensation rolling is carried out according to following method:
A1, unrestrained precompensation rolling in the operation of rolling is implemented, namely target flatness degree is wave value in;
F5, F6 and F7 frame of A2, selection finishing rolling step is as adjustment frame;
A3, under finishing mill outlet detects that the glacing flatness of band steel to be discontented with in foot-eye the condition of wave, dynamic adjustments is carried out to the bending roller force of F5, F6 and F7 frame;
A4, by adjustment bending roller force, change loading roll gap shape, carry out Dynamic controlling, alleviate the limit waveization of rolling strip profile and flatness in metasomite and tend to, make band steel reach target flatness degree;
B) in described section cooling operation, according to following method, band steel is cooled:
B1, sparse refrigerating mode is adopted to cooling section;
B2, the method for operation adopting each group of cooling manifold interval to open at cooling section;
B3, to be alleviated the plate shape problem that transverse temperature skewness in cooling procedure brings by sparse refrigerating mode;
C) after described section cooling operation terminates, following method is adopted to carry out subsequent treatment to the band steel be placed in warehouse of steel roll:
C1, employing slow cooling mode carry out follow-up disposal to the band steel be placed in warehouse of steel roll, to reduce the non-uniform temperature in cooling procedure, improve flatness defect.
2. according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that described bilateral unrestrained control method is controlled by wave in taking at finishing rolling step, adopt sparse refrigerating mode in section cooling operation and at warehouse of steel roll, slow cooling mode is adopted to band steel finished product volume, consider the affecting laws of each operation to belt steel product glacing flatness, implement multiple operation Comprehensive Control, to improve the bilateral unrestrained defect of belt steel product, improve the strip shape quality of product.
3. according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that the method for operation that described each group of cooling manifold interval is opened, comprise the method for operation that in two groups of adjacent cooling manifolds, a group of collector unlatching, another group cooling manifold are closed.
4. according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that the method for operation that described each group of cooling manifold interval is opened, comprise the method for operation that between three groups of adjacent cooling manifolds, a group of cooling manifold unlatching, other two groups of group cooling manifolds are closed.
5. according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that the method for operation that described each group of cooling manifold interval is opened, comprise the method for operation that between three groups of adjacent cooling manifolds, a group of cooling manifold closedown, other two groups of group cooling manifolds are opened.
6., according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that described slow cooling mode comprises and adopt burial pit mode, its cooling rate or rate of temperature fall are less than 5 DEG C/s.
7. according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that described slow cooling mode is included in warehouse of steel roll and coil of strip is positioned over stacking inside, other product coil of strips of four periderms surround.
8. according to the bilateral unrestrained control method of hot rolling martensitic stainless steel belt steel according to claim 1, it is characterized in that described bilateral unrestrained control method is applicable to hot-strip and produces, its strip width is 600 ~ 2200mm, its belt steel thickness is 2 ~ 8mm, and the coiling temperature of band steel is in the scope of 600 ~ 850 DEG C.
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